Buoy is a map where you are stranded on a tiny island of ice surrounding a buoy that provides light and can be used to cast shadows across the island.

Objective: Kill your opponents by throwing them off the island or through the cracked ice

Lore: The function of Buoy in the game's plot/lore is still unknown (albeit it's possible it might just be a simple sea mark buoy to allow boats and ships to navigate more safetly).